EXPOSURES › CVE-2026-45498
CVE-2026-45498
HIGH ⌖ ON CISA KEV · EXPLOITEDMicrosoft Defender allows denial of service via unspecified vulnerability, impacting DIB systems reliant on endpoint protection.
This DoS vulnerability in Microsoft Defender can disrupt critical security monitoring and endpoint protection services, potentially leaving DIB organizations exposed to unpatched attack surfaces. While not an RCE or zero-day, the active exploitation status and high severity warrant immediate patching to maintain FedRAMP/NIST 800-171 compliance.
Shame score — A DoS vulnerability is less critical than RCE or data breaches but still represents a significant operational risk that compromises security posture.
▸ RECOMMENDED ACTION Actively exploited (CISA KEV) — remediate now, ahead of your normal patch cycle.
Microsoft Defender contains an unspecified vulnerability that allows for denial of service.
| PRODUCT | STATUS |
|---|---|
| Azure Commercial Cloud Microsoft |
Authorized |
| Azure Government (includes Dynamics 365) Microsoft |
Authorized |
| Microsoft Office 365 GCC High Microsoft |
In Process |
| Office 365 Multi-Tenant & Supporting Services Microsoft |
Authorized |